Pneumatic tool



Sept. 6, 1927. ,3 7

7 F. M. SLATER PNEUMATI C To 0L Filed June 26, 1926 INVENTOR BY JQ Wafed 111/ W ASA TORNE).

Patented Sept. 6, 1927.

UNITED STATES PATENT OFFICE.

FRED MQSLATER, OF EASTON, PENNSYLVANIA, ASSIGNOR T INGEBSOLL-RAND COM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

rnnrma'rxc TOOL.

Application filed I une 2a, 1926. Serial No. 118,733;

This invention relates to pneumatic tools, but more particularly to a device for diffusing the exhaust pressure fluid during its passage from the drill.

An object of the present invention is to prevent the agitation of dust and dirt in the vicinity of the drilling operation.

Other objects will be in part obvious and in part pointed out hereinafter.

The invention consists of the combination of elements and arrangement of parts substantially as hereinafter described and more particularly pointed out in the appended claims and illustrated in the accompanying 16 drawings, in which" Figure 1 is asectional elevation of a rock drill equipped with a sleeve constructed in accordance with the practice of the invention,

I? Figure 2 is an elevation of a rock drill illustrating the manner in which the sleeve is clamped in position,

Figure 3 is a perspective view of a portion of the sleeve, and

Figure 4 is a sectional view taken through Figure 1 on the line 4-4: looking in the direction of the arrows.

Referring to the drawings, the invention is shown embodied in a rock drillhaving a g cylinder A provided at its front. end with threads B to cooperate with corresponding threads C of a front head D. The rearward end of the cylinder A is also threaded as at E to cooperate with a correspondingly threaded extension F carried by a guiding handle G. The handle G in this instance is provided with a connection H which may lead from a suitable source of supply for m conveying pressure fluid to a. passage J formed in the handle. At the inner end of the passage J is formed a valve seat K upon which is seated a valve L which controls communication between the passage .J and a bore R is arranged a push rod S to abut with one end the valve L and with its other end a thumb lever Tvpivoted in the handle G. The pressure fluid is thus admitted into the passage 0 from whence it passes through passages U and V leading from the passage 0 to an annular chamber W in the handle G, and through ports X and Y into a valve box Z located in the rearward portion of the extension F. A bottom plate I) clamped between the cylinder A and the valve box Z forms one side of a valve chamber c in which is arranged an oscillatory plate valve (1 for controlling the admission of pressure fluid through passages e and f leading to the front and rearward ends respectively of the cylinder.

A piston g reciprocates in the cylinder to deliver blows of impact to a drill steel it supported by the front head D, said drill steel in this instance being guided by a bushing j in the cylinder A and by a sleeve k inserted in the front head D. Exhaust ports 0 and p are provided for the rearward and front ends respectively of the cylinder A and are controlled by the piston g.

In order to prevent unscrewing of the front head D from the cylinder A, a notch is formed in the rearward end face of the front head D to receive a hook 1' of a spring 8 which encircles the front end of the cylinder A and carries at its opposite end a hook t which may be inserted into one of a series of apertures u formed in the cylinder A. The spring 8 is of the coil type and is adapt ed to be under a constant tension to insure against accidental unscrewing of the front headD from the cylinder A.

In accordance with the present invention the cylinder A is provided near its front end with a cylindrical flange v at the, front end of which is formed a shoulder 10. Near, the rearward end of the'cylinder is formed a similar flange w of substantially the same diameter as the flange '0. These flanges 'v and w centralize a sleeve 3 which encircles the cylinder A and abuts with its'front end the shoulder w. A series of radial slots z are cut in the rearward end of the sleeve 3 to form a plurality of clips 2 which, when the valve is in assembled position on the shoulder, will extend rearwardly of the flange m. I Y

To the end that the sleeve 3 may be held 110 firmly in position on the cylinder, an annular recess 3 is formed in the front end of the extension F and has a tapered Wall 4 which engages the clips 2 and bends them inwardly over the flange w and preferably. against the sides of the cylinder A. The sleeve 3 is of somewhat larger diameter than the body of the cylinder A sothat when these parts are assembled a space or chamber '5 will exist between the cylinder and the sleeve to receive the exhaust pressure fluid from the cylinder.

In order to diffuse the pressure fluid thus exhausting into the chamber 5, a series of ports 6 are formed in the wall of the sleeve. These ports 6 are staggered with respect to the ports 0 and p in the cylinder A so that the pressure fluid during its passage from the drill will be broken up into a number of small streams instead of being exhausted from the c linder directly to the atmosphere as is usual the case in tools of this type. By thus exhausting the pressure fluid first into the chamber 5 and then from the chamber through the exhaustports 6, the objectionable agitation of dust and cuttings in the vicinity of the drilling operation will be prevented. This is a desirable feature in tools of this type since these tools are designed principally for use in small areas, such as a narrow coal seam, where it is difficult to provide proper circulation for the removal of the dust.

In order to insure against accidental displacement of the handle G from the cylinder, a slot 7 is formed in one side of the extension F and a bolt 8 having a nut 9 is inserted through lugs 10 adjacent the slot 7 for clamping the handle firmly on the cylinder. By means of the above described invention I attain the desired objects without materially increasing the weight of the tool.

I claim: 4

1. In a pneumatic tool, the combination of a cylinder having a free exhaust port, a

sleeve around the cylinder forming a chamber to receive the exhaust pressure fluid from the'cylinder, said sleeve having ports in staggered relation to the exhaust port for the escapeof pressure fluidfrom the chamber to the atmosphere, clips formed'on one end of the sleeve, a handle for the cylinder, an extension on the handle adapted to be secured to the cylinder and to clamp the clips against the cylinder for holding the sleeve in assembled relation with respect to the cylinder.

' 2. In a pneumatic tool, thercombination of ports for the passage of pressure fluid from the chamber to the atmosphere, an extension on the handle adaptd to be secured to the cylinder, and an annular recess in the exten-' sion to receive the clips, said recess having a tapered wall to bend the clips inwar ly agminst the cylinder for holding thesleeve in assembled positionon the cylinder.

In a pneumatic tool, the combination of a cylinder having a free exhaust port, front and rear external flanges on. the' c linder, a shoulder near the front end 0 the cylinder, a. sleeve abutting'the shoulder and centralized on the flanges to form a chamber for the reception of exhaust pressure fluid from the cylinder, said sleeve having ports for the passage of pressure fluid from the chamber to the atmosphere, clips formed on one end of the sleeve, a handle, an extension on the handle adapted to be secured on the end of the cylinder, and an annular recess in the front end of the extension to receivethe clips, said recess having a tapered Wall" to bend the clips inwardly over the rear' flanges and against the cylinder for holdin the sleeve in assembled position on the cy inder.

In testimony whereof I have signed this specification.

FRED M. SLATER. 

